Finding the Fourth Proportional to 1,116.29, 1,672.38 and 807.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.29 : 1,672.38 = 807.39 : x
2. Step 2: Convert to fraction form
   1,116.29/1,672.38 = 807.39/x
3. Step 3: Cross multiply
   1,116.29x = 1,672.38 × 807.39
4. Step 4: Simplify right side
   1,116.29x = 1,350,262.89
5. Step 5: Solve for x
   x = 1,350,262.89/1,116.29
6. Step 6: Final answer
   x = 1,209.60